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What PCOS testing usually involves
If you are struggling to conceive, it is reasonable to ask whether polycystic ovary syndrome (PCOS) could be affecting ovulation. In the UK, a fertility assessment for PCOS usually looks at your symptoms, blood tests, and sometimes an ultrasound scan.
PCOS is not diagnosed with one single test. Your GP or fertility clinic will usually combine several results to see whether your hormone levels and ovulation pattern fit the condition.
Blood tests to ask about
Hormone blood tests are often the first step. These may include testosterone, SHBG, LH, FSH, prolactin, thyroid function, and sometimes DHEAS and 17-hydroxyprogesterone, depending on your symptoms.
Your doctor may also check anti-Müllerian hormone, or AMH. A higher AMH can be seen in PCOS, but it is not a standalone diagnosis and should be interpreted alongside other findings.
If you are not having regular periods, your clinician may also want to confirm whether you are ovulating. Progesterone is sometimes measured in the second half of the cycle, although this is only useful if your cycles are predictable enough.
Ultrasound scanning and cycle history
An ultrasound scan of the ovaries may be offered to look for the typical “polycystic” appearance. This does not mean you definitely have PCOS, because some people have this scan result without having the syndrome.
Your cycle pattern matters too. If your periods are infrequent, very irregular, or absent, that can suggest ovulation is not happening regularly. This is one of the key reasons PCOS can make it harder to conceive.
Other fertility tests often checked at the same time
When asking for fertility tests, it is sensible to make sure other common causes are also reviewed. In the UK, this often includes a semen analysis for your partner and tests to check whether your fallopian tubes are open, if appropriate.
Doctors may also test for thyroid problems, raised prolactin, diabetes or insulin resistance, because these can overlap with PCOS and affect fertility. Weight, blood pressure, and signs such as acne or excess hair growth may also be considered.
What to ask your GP or fertility clinic
You could ask: “Can you check whether PCOS is affecting my ovulation and fertility?” That helps open a discussion about hormone blood tests, ultrasound, and whether further referral is needed.
It is also helpful to ask whether you need investigations for other causes of irregular periods or infertility. If PCOS is confirmed, your doctor can discuss ways to improve ovulation and the chances of pregnancy.
Frequently Asked Questions
Polycystic ovary syndrome testing fertility tests to ask for when struggling to conceive refers to the hormone, ovulation, and ultrasound tests often used to check whether PCOS may be affecting fertility. It is important because PCOS can cause irregular or absent ovulation, which can make conception harder, and testing helps guide treatment.
Common blood tests include total and free testosterone, DHEAS, LH, FSH, estradiol, prolactin, TSH, AMH, and sometimes 17-hydroxyprogesterone. These tests help evaluate hormone imbalance, ovulation issues, thyroid disease, and other causes of infertility.
A testosterone test checks for elevated androgens, which are common in PCOS. Higher androgen levels can contribute to irregular periods, acne, excess hair growth, and problems with ovulation.
AMH, or anti-Mullerian hormone, often reflects the number of small follicles in the ovaries. In PCOS, AMH may be elevated, which can support the diagnosis and give information about ovarian reserve, though it does not by itself prove fertility.
Ovulation testing helps determine whether an egg is being released regularly. Because PCOS often disrupts ovulation, confirming whether ovulation is happening is a key step in evaluating infertility.
A pelvic ultrasound may show enlarged ovaries with multiple small follicles, a pattern often seen in PCOS. Ultrasound also helps rule out other ovarian or uterine problems that could affect conception.
Thyroid problems can cause irregular periods, ovulation problems, and fertility issues that can resemble PCOS. Testing TSH and sometimes free T4 helps identify thyroid disease that may need treatment.
High prolactin can interfere with ovulation and menstrual regularity. Checking prolactin helps rule out another treatable cause of infertility that may look similar to PCOS.
FSH and LH help evaluate how the brain and ovaries are communicating. In PCOS, LH may be relatively higher than FSH, which can support the diagnosis and give clues about ovulatory function.
Glucose and insulin testing can detect insulin resistance, which is common in PCOS. Insulin resistance can worsen hormone imbalance and ovulation problems, so identifying it helps guide lifestyle and medical treatment.
Hemoglobin A1c shows average blood sugar over about three months. It helps screen for prediabetes or diabetes, which are more common in people with PCOS and can affect overall reproductive health.
This test helps rule out nonclassic congenital adrenal hyperplasia, a condition that can cause symptoms similar to PCOS, such as irregular periods and elevated androgens. It is often ordered when hormone results are unclear.
Infertility can involve more than one partner, so a semen analysis checks sperm count, movement, and shape. Even if PCOS is present, evaluating sperm is an important part of a complete fertility workup.
Yes, if there are risk factors or if initial treatment does not work, testing the fallopian tubes may be helpful. A hysterosalpingogram or similar test checks whether the tubes are open so sperm and egg can meet.
No single test diagnoses PCOS. Diagnosis is usually based on symptoms, menstrual history, signs of androgen excess, blood work, and ultrasound findings while also ruling out other causes.
Someone should ask for evaluation if they have irregular periods, signs of excess androgens, difficulty predicting ovulation, or have been trying to conceive without success. Earlier testing is reasonable if cycles are very infrequent or absent.
If cycles are regular, infertility is often evaluated after 12 months of trying if under 35, or after 6 months if 35 or older. If periods are irregular or absent, testing should be discussed sooner.
Additional tests may include mid-luteal progesterone to confirm ovulation, an antral follicle count on ultrasound, and sometimes ovarian reserve testing. These help clarify whether and how often ovulation is happening.
The results can show whether ovulation induction, weight and metabolic management, insulin-sensitizing treatment, or referral to a fertility specialist is most appropriate. Testing helps match treatment to the main cause of conception difficulty.
Useful questions include which hormone tests are needed, whether ovulation is happening, whether thyroid or prolactin problems should be ruled out, whether a semen analysis is needed, and whether tubal testing is appropriate. These questions help ensure the fertility evaluation is complete.
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